<asp:TemplateField HeaderText="Received Amount">
<EditItemTemplate>
<asp:TextBox runat="server" ID="txt_recamt" Width="90px"></asp:TextBox>
<asp:RequiredFieldValidator ID="RFVrecamt" runat="server" ControlToValidate="txt_recamt" Display="None" ErrorMessage="Must Enter Received Amount" ValidationGroup="duereport"></asp:RequiredFieldValidator>
</EditItemTemplate>
</asp:TemplateField>